NAME
       strchr, strrchr, strchrnul - locate character in string
SYNOPSIS
       #include <string.h>
       char *strchr(const char *s, int c);
       char *strrchr(const char *s, int c);
       #define _GNU_SOURCE
       #include <string.h>
       char *strchrnul(const char *s, int c);
DESCRIPTION
       The  strchr() function returns a pointer to the first occurrence of the
       character c in the string s.
       The strrchr() function returns a pointer to the last occurrence of  the
       character c in the string s.
       The strchrnul() function is like strchr() except that if c is not found
       in s, then it returns a pointer to the null  byte  at  the  end  of  s,
       rather than NULL.
       Here "character" means "byte"; these functions do not work with wide or
       multi-byte characters.
RETURN VALUE
       The strchr() and strrchr() functions return a pointer  to  the  matched
       character or NULL if the character is not found.
       The strchrnul() function returns a pointer to the matched character, or
       a pointer to the null byte at the end of s (i.e., s+strlen(s))  if  the
       character is not found.